deleteUser method
删除用户
Implementation
Future<dynamic> deleteUser(int userId) async {
return await YTHttp.postFormData(
YTIMUrls.IM_USER_DELETE,
YTHttp.getSignedParams([
'appId=$_appID',
'timestamp=${DateTime.now().millisecondsSinceEpoch.toString().substring(0, 10)}',
'userId=$userId',
]),
);
}